Persistent problems have been reported on board the fleet of Type 45 destroyers, which cost £1bn each to build, and this has led to concerns over how reliable they are.
The Ministry of Defence insisted the refit "will ensure increased availability and resilience over the life of the ships".
A spokesman added: "The Type 45 destroyers are hugely capable ships and have consistently made a difference to our safety and security."
It is expected that the maintenance work on the engines will cost tens of millions of pounds.
The MoD had already committed to improving each warship's integrated electric propulsion systems.
The warships are used in "hunting pirates, drug runners or submarines, defending the fleet from air attack, and providing humanitarian aid after natural disasters", according to the MoD.
To make sure some of the vessels remain operational at all times, the refits will be staggered over several years.
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